Scored cylinder how bad before replacement?

[sefh3]

Be careful! Wear gloves, long sleeves, and eye/face protection. The acid fumes can be rough. I like to pour a SMALL amount into a little plastic cup and dip the q-tips in that. Keep the jug closed. Don't splash it. It's not gonna kill you, but it can hurt...

Don't forget the mask. Isolation masks are cheap and help the lungs.

 

[roncoinc]

Best thing is outside and UPwind
keep PLENTY water handy too,

 

[JJay03]

Thanks guys
Whats the best thing to soak a cylinder in to dissolve the carbon?

 

[Eccentric]

Thanks guys
Whats the best thing to soak a cylinder in to dissolve the carbon?

Chevron fuel injector cleaner works pretty good.

 

[JJay03]

Chevron fuel injector cleaner works pretty good.

Might get expensive to soak the whole cylinder in tho? I thought about trying to soak it in purple power cause I know it works pretty well on carbon.

 

[jimbo1490]

One safety tip about working with acid that's often overlooked, especially for those that work by themselves:

Make sure you have a source of emergency rinse water ready to go right nearby before you open the acid container!


If you get any acid in your eyes, you will only have a very short time (seconds really) to get it out before you get eye damage. Also you will be in intense pain, like crazy intense. Twice now, I have been working with people that got strong caustics in their eyes, once with phosphoric acid, once with Skydrol (Google it if you want to know). IN BOTH CASES, the victim was COMPLETELY UNABLE to get himself over to the water because the pain completely stunned him! We had to drag him there and force his eyes open and help him wash them out! Both times we were indoors in a very large open building with a set tub and several eyewash stations.

I like to work out in the yard with acid with the garden hose right next to me, turned on to a soft flow within arm's reach. If I ever get into trouble, I won't be fumbling around looking for the hose, then fumbling around trying to turn it on because I know from experience that won't work out well!

One of those eye wash bottles is even better since they contain a buffered solution that helps neutralize the acid.

Jimbo

 

[JJay03]

Good tip always need to keep water close by when working with chemicals like that. I was working with air craft stripper and got some on my skin doesnt take long before you are running for the water.

 

[SawGarage]

Clean the cylinder, polish the piston, and run it.

+1 100% :agree2:

with the amount of machine marks still there, your piston will be within spec for another 800 hrs...

 

[JJay03]

Got the cylinder cleaned up should I hone it to help seat the new rings? Do you guys always check the gap on new oem rings also?

 

[a. palmer jr.]

Dealer said if anything maybe new rings but thought it was ok also. Trying to decide how to clean up the cylinder where would I get that acid or should I just sand it with some fine grit.

I could mail you some but I doubt my mailman would like me anymore!

 

[a. palmer jr.]

Got the cylinder cleaned up should I hone it to help seat the new rings? Do you guys always check the gap on new oem rings also?

I always just run a little automotive sandpaper like 400 grit around the cylinder, never up and down. It will roughen the cylinder up enough to seat the rings.

 

[JJay03]

Alright thanks palmer

 

[JJay03]

Wet sanded with some 360 hopefully thats good enough. CLeaned up the exhaust port really good too.

 

[a. palmer jr.]

Looks good to me. Be sure and oil it good before re-assembly, regular 2 stroke oil will be fine, plus a little oil on the rings and it should be ready to go! Just don't run the carburetor too lean during the break-in.

 

[JJay03]

Got a new piston cause I got a good deal on it. Question is why are the markings different? Its the correct part number according to the book and its identical except for that. The piston was missing a clip not a big deal tho. Im guessing the closed side on the pin suppose to face the intake side I cant remember though.

Edit: found this in another thrread......Stihl also made A/B pistons, that are a compromise for a A and B cylinders

 

[rms61moparman]

Clean the cylinder, polish the piston, and run it.

Dang Brad!!!

You are starting to sound like me now............except for that funny accent of yours!
I'm gonna teach you something yet!!!LOL

I agree totally with Brad on this one.
I am running several saws that were in worse shape than that. Clean them up, slap in fresh rings and run it like you borrowed it from your Brother-in-law!!!

Mike

 

[JJay03]

Dang Brad!!!

run it like you borrowed it from your Brother-in-law!!!

Now thats pretty funny lol.

 

[a. palmer jr.]

Got a new piston cause I got a good deal on it. Question is why are the markings different? Its the correct part number according to the book and its identical except for that. The piston was missing a clip not a big deal tho. Im guessing the closed side on the pin suppose to face the intake side I cant remember though.

Edit: found this in another thrread......Stihl also made A/B pistons, that are a compromise for a A and B cylinders

Generally on car pistons they have an arrow that points toward the front of the engine. I think I read somewhere that the opening (gap) of the ring is supposed to point away from the exhaust port on chainsaws.

 

[andrethegiant70]

Oh, hey, I don't think anyone mentioned it yet but, to me, that piston looked like it might have been on its way to melt down. If the piston was just scratched, your mention of carbon might have made more sense. The fact that you've got aluminum transfer on the jug tells me that you were melting your piston.

Bottom line, your saw is running LEAN.

 

[Pendagator]

I've cleaned a few cylinders with muriatic acid and I wore safety glasses and then a full face shield to protect my eyes. I had on latex gloves I think, but they didn't last long. I got some long Q-tips from a medical supply- that helps to keep it off your hands.

Speaking of Muriatic acid, I'm thinking about prepping a garage floor for epoxy paint. Wonder how dangerous that acid is? Anybody ever done this? Of course I'm going to wear a face shield, boots and respirator mask. Sure don't want to get over come by fumes and "burn" out my lungs. Don't know if old work boot will portect my feet or not. I could put some plastic bags over my feet first. What do you think the acid will do to pavement when I wash it out of my garage?